<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
    class Person{
        constructor(name,age){
            this.name=name;
            this.age=age;
        }
        sayName(){
            console.log(this.name);
        }
    }
    let di=new Person("ding",18);
    console.log(di);
    </script>
</body>
</html>